I have a 1998 Wrangler that sat for the winter and was running great when I parked it. Now the engine looks as though its having a seizure it shakes so bad. The number four cylinder doesn’t seem to be firing however the plug and wire has good spark. I have changed the distributor, cap and rotor, plugs and wires, fuel injectors, pulled the valve cover and checked rockers, did compression test which was well over 100, checked for power to the #4 injector, swapped injectors around yet still #4 is not firing. Oh and the fuel injector rail is not plugged. Any ideas??

I've noticed that when my batter is LOW on charge and I try to start it, it acts like it loses time. This has happened to me 2 times now. If I let it run, it will eventually even out, but it is like the computer has lost all learn and has no idea where time should be.

It is scary. The first time it happened I thought something serious broke. Eventually it straightens out but it take a few minutes of driving. It's a weird peculiarity of my Jeep I guess.

I have a 1998 Wrangler that sat for the winter and was running great when I parked it. Now the engine looks as though its having a seizure it shakes so bad. The number four cylinder doesnt seem to be firing however the plug and wire has good spark. I have changed the distributor, cap and rotor, plugs and wires, fuel injectors, pulled the valve cover and checked rockers, did compression test which was well over 100, checked for power to the #4 injector, swapped injectors around yet still #4 is not firing. Oh and the fuel injector rail is not plugged. Any ideas??

Kshaws21 I live in Vermont so yes plenty of snow however she sucks on the slightest bit of ice so I use my Grand Cherokee for the winter months. Rob3811 it sat since last October or so I ran it for about 30 minutes January which at that point it ran normal. One thing I will say is that the battery is dead I have to jump it every time

Kshaws21 I live in Vermont so yes plenty of snow however she sucks on the slightest bit of ice so I use my Grand Cherokee for the winter months. Rob3811 it sat since last October or so I ran it for about 30 minutes January which at that point it ran normal. One thing I will say is that the battery is dead I have to jump it every time

If the battery is dead the ECM won't hold any codes, history, or mapping. Now you need to put new codes and mapping back into the ECM by driving it. You need a few engine cycles on/off with a few drive cycles. When you started it back in January the battery may have just had enough juice to hold codes but not start the jeep. I would get a new battery to start and drive it.